PYTHON-5781 Coverage increase for `network_layer.py` #4478

Job	Run time
Make SDist	45s
Build wheels for manylinux_x86_64	2m 20s
Build wheels for manylinux_i686	2m 28s
Build wheels for manylinux_aarch64	14m 41s
Build wheels for macos	3m 16s
Build wheels for win_amd6	4m 45s
Build wheels for manylinux_s390x	11m 25s
Build wheels for manylinux_ppc64le	16m 58s
Build wheels for win_arm64	6m 50s
Build wheels for win32	4m 24s
Download Wheels	10s
	1h 8m 2s

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