PYTHON-5781 Coverage increase for `network_layer.py` #4453

Job	Run time
Make SDist	46s
Build wheels for win_amd6	4m 24s
Build wheels for macos	4m 39s
Build wheels for win32	5m 1s
Build wheels for manylinux_x86_64	2m 10s
Build wheels for win_arm64	6m 44s
Build wheels for manylinux_ppc64le	13m 20s
Build wheels for manylinux_aarch64	14m 35s
Build wheels for manylinux_s390x	15m 6s
Build wheels for manylinux_i686	2m 32s
Download Wheels	9s
	1h 9m 26s

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